The General Services Administration has launched a full review of its key online procurement system, after discovering a security vulnerability that may have exposed users’ sensitive data. The security flaw was reported to GSA on March 8, and the agency has since issued a software patch on the system and is investigating potential impacts to vendors registered in GSA’s System for Award Management (SAM). “When we got the word that this might be the case, we got right on it,” GSA Acting Administrator Dan Tangherlini told reporters Tuesday following a congressional hearing. “And there is nothing that we won’t do,…